import java.io.IOException;
import java.net.*;
import java.util.Scanner;

/**
 * @Author liangzai
 * @Description:
 */
public class UdpEchoClient {
    private DatagramSocket socket = null;
    private String serverIp;
    private int serverPort;

    public UdpEchoClient(String serverIp, int serverPort) throws SocketException {
        this.serverIp = serverIp;
        this.serverPort = serverPort;
        socket = new DatagramSocket();
    }

    private void start() throws IOException {
        Scanner scanner = new Scanner(System.in);
        while(true){
            System.out.println("请输入你的请求:");
            if(!scanner.hasNext()){
                break;
            }
            String request = scanner.nextLine();
            DatagramPacket requestPacket = new DatagramPacket(request.getBytes(),request.getBytes().length,
                    InetAddress.getByName(serverIp),serverPort);

            socket.send(requestPacket);

            DatagramPacket responsePacket = new DatagramPacket(new byte[4090],4090);
            socket.receive(responsePacket);

            String response = new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient client = new UdpEchoClient("127.0.0.1",9090);
        client.start();
    }
}
